One of the examples of the action of the autonomous nervous system is

Options

A. swallowing of food
B. pupillary reflex
C. peristalsis of the intestine
D. all of these

Explanation

To answer the question "One of the examples of the action of the autonomic nervous system is," we will follow these steps:

### Step 1: Understand the Autonomic Nervous System
The autonomic nervous system (ANS) is a part of the peripheral nervous system that controls involuntary bodily functions. It regulates processes that occur without conscious control, such as heart rate, digestion, and respiratory rate.

**Hint:** Remember that the ANS is responsible for involuntary actions in the body.

### Step 2: Identify Involuntary Actions
Involuntary actions are those that occur automatically and are not under conscious control. Examples include:
- Heartbeat
- Swallowing food
- Movements of the gastrointestinal tract (GIT)
- Pupillary reflex (the constriction and dilation of pupils in response to light)

**Hint:** Think about actions that happen without you having to think about them.

### Step 3: Analyze the Examples Given
From the video transcript, we can see that several examples of involuntary actions controlled by the ANS were mentioned:
- Beating of the heart (heartbeat)
- Swallowing food
- Movements of the gastrointestinal tract
- Pupillary reflex

**Hint:** Look for actions that are automatic and happen regardless of your will.

### Step 4: Conclude the Correct Answer
Since all the examples mentioned (heartbeat, swallowing, GIT movements, and pupillary reflex) are actions of the autonomic nervous system, the correct answer to the question is that all of these are examples of the ANS in action.

**Hint:** If multiple options are provided, consider if all listed actions fit the criteria of being involuntary.

### Final Answer
The correct answer is: **All of these** (option B).